A semi-retired worker is typically a senior who has stopped working full-time but still has temporary, flexible, or part-time employment. These opportunities exist in a variety of industries. A retiree can continue working in their career field on a part-time basis. For example, a teacher can work as a part-time substitute. A retiree can return to work as a consultant in their field or as a mentor or trainer for new professionals. A senior in part-time retirement can also work for a retail or customer service employer on a part-time schedule.